Sort out the apt-snapshots-disk partition situation on apt.lizard

Due to the implementation of Vagrant builds in Jenkins being deployed before #12002 (closed), we could not grow this partition as much as planned/needed. On top of that, we had to freeze a bit more APT snapshots than usual for #5630 (closed). So our monitoring is rightfully complaining that the disk space left on the apt-snapshosts-disk partition of apt.lizard is critical.

Parent Task: #5630 (closed)

Related issues

• Related to #12829 (closed)
• Related to #12002 (closed)
• Related to #13526 (closed)

Original created by @bertagaz on 12725 (Redmine)